From 35e8ea2d897a400d0e5dcf2aee975ecb12b0ab2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fe=CC=81lix=20Pe=CC=81ault?= <hello@flayks.com>
Date: Tue, 23 Nov 2021 12:33:46 +0100
Subject: [PATCH] Implement Fullscreen for mobile on photo Viewer

---
 .../[country]/[location]/[photo].svelte       | 55 ++++++++++-
 src/style/atoms/_button-circle.scss           | 26 ++++--
 src/style/pages/_viewer-photo.scss            | 93 ++++++++++++++++---
 3 files changed, 150 insertions(+), 24 deletions(-)

diff --git a/src/routes/[country]/[location]/[photo].svelte b/src/routes/[country]/[location]/[photo].svelte
index 3dff824..9463bee 100644
--- a/src/routes/[country]/[location]/[photo].svelte
+++ b/src/routes/[country]/[location]/[photo].svelte
@@ -1,6 +1,9 @@
 <script lang="ts">
     import { browser } from '$app/env'
     import { page } from '$app/stores'
+    import { tick } from 'svelte'
+    import { scale } from 'svelte/transition'
+    import { quartOut } from 'svelte/easing'
     import { getAssetUrlKey } from '$utils/helpers'
     import { throttle } from '$utils/functions'
     import { swipe } from '$utils/interactions/swipe'
@@ -25,8 +28,10 @@
     enum directions { PREV, NEXT }
 
     let innerWidth: number
+    let fullscreenEl: HTMLElement
     let globalOffset = offset
     let isLoading = false
+    let isFullscreen = false
     let hasNext = offset + limit < countPhotos
     let hasPrev = offset > 0
 
@@ -61,10 +66,14 @@
      * Photo navigation
      */
     // Go to next photo
-    const goToNext = throttle(() => canGoPrev && currentIndex++, 200)
+    const goToNext = throttle(() => {
+        canGoPrev && currentIndex++
+    }, 200)
 
     // Fo to previous photo
-    const goToPrevious = throttle(() => canGoNext && (currentIndex = Math.max(currentIndex - 1, 0)), 200)
+    const goToPrevious = throttle(() => {
+        canGoNext && (currentIndex = Math.max(currentIndex - 1, 0))
+    }, 200)
 
     // Enable navigation with keyboard
     const handleKeydown = ({ key, defaultPrevented }: KeyboardEvent) => {
@@ -95,6 +104,25 @@
     }
 
 
+    /**
+     * Fullscreen for mobile
+     */
+    const toggleFullscreen = async () => {
+        if (innerWidth < 992) {
+            isFullscreen = !isFullscreen
+
+            // Scroll at middle of photo
+            if (isFullscreen) {
+                // Wait for fullscreen children to be mounted
+                await tick()
+                const picture = fullscreenEl.querySelector('picture')
+                const image = fullscreenEl.querySelector('img')
+                picture.scrollTo((image.offsetWidth - innerWidth) / 2, 0)
+            }
+        }
+    }
+
+
     /**
      * Load photos
      */
@@ -188,8 +216,10 @@
 
 <main class="viewer-photo">
     <div class="container grid">
+        <p class="viewer-photo__notice text-label">Tap for fullscreen</p>
+
         <div class="viewer-photo__carousel">
-            <div class="viewer-photo__images" use:swipe on:swipe={handleSwipe}>
+            <div class="viewer-photo__images" use:swipe on:swipe={handleSwipe} on:tap={toggleFullscreen}>
                 {#each visiblePhotos as photo, index (photo.id)}
                     <Image
                         class="photo photo--{currentIndex === 0 ? index + 1 : index}"
@@ -238,6 +268,25 @@
             </div>
         </div>
     </div>
+
+    {#if isFullscreen}
+        <div class="viewer-photo__fullscreen" bind:this={fullscreenEl} on:click={toggleFullscreen}>
+            <div class="inner" transition:scale={{ easing: quartOut, start: 1.1, duration: 1000 }}>
+                <Image
+                    id={currentPhoto.image.id}
+                    sizeKey="photo-grid-large"
+                    width={1266}
+                    height={844}
+                    alt={currentPhoto.title}
+                />
+                <ButtonCircle color="gray-medium" class="close">
+                    <svg width="18" height="18" viewBox="0 0 18 18" fill="#fff" xmlns="http://www.w3.org/2000/svg">
+                        <path fill-rule="evenodd" clip-rule="evenodd" d="M7.751 0c4.274 0 7.752 3.477 7.752 7.751 0 1.846-.65 3.543-1.73 4.875l3.99 3.991a.81.81 0 1 1-1.146 1.146l-3.99-3.991a7.714 7.714 0 0 1-4.876 1.73C3.477 15.503 0 12.027 0 7.753 0 3.476 3.477 0 7.751 0Zm0 1.62a6.138 6.138 0 0 0-6.13 6.131 6.138 6.138 0 0 0 6.13 6.132 6.138 6.138 0 0 0 6.131-6.132c0-3.38-2.75-6.13-6.13-6.13Zm2.38 5.321a.81.81 0 1 1 0 1.62h-4.76a.81.81 0 1 1 0-1.62h4.76Z" />
+                    </svg>
+                </ButtonCircle>
+            </div>
+        </div>
+    {/if}
 </main>
 
 
diff --git a/src/style/atoms/_button-circle.scss b/src/style/atoms/_button-circle.scss
index 6279164..d665f8e 100644
--- a/src/style/atoms/_button-circle.scss
+++ b/src/style/atoms/_button-circle.scss
@@ -4,12 +4,17 @@
     display: flex;
     align-items: center;
     justify-content: center;
-    width: 56px;
-    height: 56px;
+    width: 44px;
+    height: 44px;
     background: #fff;
     border-radius: 100vh;
     transition: background-color 0.8s var(--ease-quart);
 
+    @include bp (md) {
+        width: 56px;
+        height: 56px;
+    }
+
     & > * {
         width: 22px;
         height: 22px;
@@ -88,28 +93,33 @@
 
     // Pink color
     &--pink {
-        background-color: $color-secondary;
+        background: $color-secondary;
 
         &:hover {
-            background-color: darken($color-secondary, 7);
+            background: darken($color-secondary, 7);
         }
     }
 
     // Purple color
     &--purple {
-        background-color: $color-primary-tertiary20;
+        background: $color-primary-tertiary20;
 
         &:hover {
-            background-color: $color-lightpurple;
+            background: $color-lightpurple;
         }
     }
 
     // Gray color
     &--gray {
-        background-color: #F2F2F2;
+        background: #F2F2F2;
 
         &:hover {
-            background-color: #D2D2D2;
+            background: #D2D2D2;
         }
     }
+
+    // Gray color
+    &--gray-medium {
+        background: $color-gray;
+    }
 }
diff --git a/src/style/pages/_viewer-photo.scss b/src/style/pages/_viewer-photo.scss
index 1d31cac..5c92c19 100644
--- a/src/style/pages/_viewer-photo.scss
+++ b/src/style/pages/_viewer-photo.scss
@@ -1,10 +1,12 @@
 .viewer-photo {
+    position: relative;
     height: 100vh;
     display: flex;
     align-items: center;
     overflow: hidden;
 
     .container {
+        position: relative;
         height: 100%;
 
         @include bp (md, max) {
@@ -14,21 +16,25 @@
 
     // Carousel
     &__carousel {
-        display: grid;
-        grid-column: span var(--columns);
-        grid-row-gap: 20px;
-        max-width: 720px;
-        margin: auto 0;
-        height: 100%;
-        position: relative;
+        position: absolute;
+        top: 0;
         left: 50%;
-        transform: translateX(-50%);
+        transform: translate3d(-50%, 0, 0);
+        grid-column: span var(--columns);
+        display: grid;
+        grid-row-gap: 20px;
+        width: calc(100% - 40px);
+        height: 100%;
+        max-width: 720px;
+        position: relative;
 
         @include bp (md) {
+            position: relative;
             max-width: none;
             margin: auto 0;
             grid-column: 3 / span 16;
             grid-row-gap: 40px;
+            transform: translate3d(-50%, 2.5%, 0);
         }
     }
 
@@ -181,12 +187,14 @@
 
     // Infos
     &__info {
+        bottom: 0;
         margin-top: auto;
         margin-bottom: 40px;
         padding: 0 20px;
         text-align: center;
 
         @include bp (md) {
+            position: static;
             margin-top: 0;
             padding: 0;
             text-align: left;
@@ -212,7 +220,7 @@
             display: inline-block;
             align-items: center;
             margin-top: 24px;
-            color: $color-tertiary;
+            color: rgba($color-tertiary, 0.7);
             line-height: 1.5;
 
             @include bp (md) {
@@ -226,12 +234,12 @@
             }
 
             a {
-                color: $color-tertiary;
+                color: inherit;
                 text-decoration: none;
                 transition: color 0.3s;
 
                 &:hover {
-                    color: $color-secondary-light;
+                    color: $color-tertiary;
                 }
             }
 
@@ -257,7 +265,7 @@
         position: absolute;
         z-index: 1;
         left: 50%;
-        bottom: calc(92% + 1vw);
+        bottom: calc(91% + 1vw);
         display: block;
         line-height: 1;
         color: rgba($color-tertiary, 0.4);
@@ -271,12 +279,16 @@
         }
         @include bp (md) {
             top: 50%;
-            left: min(68vw, 1296px);
+            left: auto;
+            right: calc(-1 * min(30vw, 400px));
             width: 350px;
             text-align: center;
             bottom: auto;
             transform: translate3d(0, -50%, 0);
         }
+        @include bp (lg) {
+            right: calc(-1 * min(25vw, 460px));
+        }
     }
 
     // Controls
@@ -326,4 +338,59 @@
             }
         }
     }
+
+    // Fullscreen viewer
+    &__fullscreen {
+        position: absolute;
+        z-index: 101;
+        top: 0;
+        left: 0;
+        width: 100%;
+        height: 100%;
+
+        .inner {
+            width: 100%;
+            height: 100%;
+        }
+        picture {
+            width: 100%;
+            height: 100%;
+            overflow: auto;
+            cursor: pointer;
+        }
+        img {
+            display: block;
+            width: auto;
+            height: 100%;
+            object-fit: contain;
+            pointer-events: none;
+            user-select: none;
+        }
+
+        .close {
+            $color-shadow: rgba(#000, 0.15);
+            position: absolute;
+            z-index: 2;
+            bottom: 24px;
+            left: 50%;
+            transform: translateX(-50%);
+            box-shadow:
+                0 6px 6px $color-shadow,
+                0 12px 12px $color-shadow,
+                0 24px 24px $color-shadow;
+        }
+    }
+
+    // Notice
+    &__notice {
+        position: absolute;
+        top: 16px;
+        left: 20px;
+        line-height: 44px;
+        color: rgba($color-tertiary, 0.5);
+
+        @include bp (md) {
+            display: none;
+        }
+    }
 }
\ No newline at end of file